Erika Deus, a sharp and seductive noble daughter, approaches Instructor Raide seeking "special treatment" in her academy evaluations. She attempts to leverage her family's influence, offering to help Raide's family inn, Suzuya, with its troubles with the Dwarf Chamber of Commerce and "noisy" adventurers. But Raide, already aware of the Dwarf Chamber's harassment of his stepmother Nimi and having already "tamed" his rowdy adventurers, deftly turns the tables. Instead of lenient grades, he offers Erika a far more valuable "special treatment": the hidden truth behind skill acquisition. He produces an expensive Dolpel, a magic tool for mock battles, and reveals that fighting the same opponent 100 times grants a skill. Erika, who had conveniently stopped at 99 battles, is stunned as she immediately gains a skill after one more fight. This revelation not only demonstrates Raide's superior knowledge but also flips the dynamic, leaving Erika impressed and indebted, effectively turning her attempted blackmail into a mutually beneficial partnership.

Raide's game knowledge is put to its most critical test when he intervenes to prevent the predetermined "first death" of Felica Dragor, a fellow instructor and Roy's sister. Knowing she is fated to be kidnapped and violated by the Dwarf Chamber of Commerce son in a specific alley at a specific time, Raide arrives with Erika, confronts the culprit, and saves Felica. His ruthless efficiency, born from wartime experience, sees the son arrested and his own position solidified. This direct alteration of a major plot point confirms the power of his "cheat." In parallel, Raide's "tough love" routine with his stepmother Nimi, where he sleeps beside her to alleviate her exhaustion and prevent her from making self-sacrificing choices, finally culminates. After 20 days, Nimi gives "the signal," and they become lovers, cementing a deeply personal bond.

Leveraging his real-world technical knowledge, Raide identifies a critical flaw in Overworld's fashion: the absence of functional underwear like bras. Observing his female students struggling with their large chests during training, he proposes the concept of supportive bras and non-riding panties to Marika, the owner of Flower Mist. With Erika's investment and the academy headmistress Croana's enthusiastic cooperation (who also admits her own struggles with her "loli huge breasts"), this idea explodes into a massive business venture. The new underwear not only improves student performance but also generates immense profits and influence, giving Raide significant capital and a growing network. This strategic move transforms a personal observation into an economic powerhouse, demonstrating how Raide's unique blend of knowledge can reshape the world beyond mere survival, laying the groundwork for future interventions and solidifying his position as a central figure in this new reality.

The Deus family's hidden rot is fully exposed when Erika's older brother, Delt, attempts to threaten Raide. Raide, however, turns the tables, forcing Delt to sign a document under duress. Following this, Raide discovers the Count Deus has abandoned Erika and her mother, Elysia, after years of prostituting Elysia to other nobles. The family butler, in a desperate act of loyalty, had been giving Elysia sleeping drugs to make her appear ill, protecting her from further abuse. Raide immediately takes Erika and Elysia under his protection, moving them into a property he owns, and obtains Elysia's list of eight noble names. He then confronts Prime Minister Galt and King Adam with meticulous documents detailing the nobles' corruption. King Adam agrees to "collect donations" from these nobles, signaling a political offensive. Concurrently, Felica, Lucian (Lucy's mother), Croana (the Headmistress), and later Fia and Leah (Criella clan sisters) all confess their love and become Raide's lovers, rapidly expanding his personal and protective sphere.